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Basic properties of insulating materials

Oct 22, 2018

Main performance indicators of insulating materials

In order to prevent accidents caused by insulation performance damage of insulating materials, it is necessary to make insulating materials conform to the performance indicators stipulated in the national standards. There are many performance indicators of insulation materials, and the characteristics of various insulation materials are different. The main performance indicators of commonly used insulation materials are breakdown strength, heat resistance, insulation resistance and mechanical strength.

(1) breakdown strength. Insulating material will be damaged and lose its insulation performance under the action of electric field strength higher than a certain value. This phenomenon is called breakdown. The electric field intensity when the insulation material is broken is called breakdown strength. The unit is kV/mm.

(2) heat resistance. When the temperature rises, the resistance, breakdown strength and mechanical strength of insulating materials will decrease. Therefore, insulation materials are required to work at a specified temperature for a long time and ensure reliable insulation performance. The heat resistance of different components of insulation materials is different. The heat resistance grades can be divided into 7 grades, such as Y, A, E, B, F, H, C and so on. The maximum operating temperature of each grade of insulation materials is stipulated.

Class C: the limit working temperature is greater than 180 C. Inorganic substances, such as quartz, asbestos, mica, glass, ceramics and tetrafluoroethylene plastics, that do not use any organic binder or impregnating agent.